Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – SMACO 2-in-1 600W Underwater Propeller [EU] (-3 USD)
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGDG40576, FIND16270, BGb10486, BGissamd1, BGP7724, 7bcdf9, BG621dfe, BG10OFFAFF1, BG4d9120, BGAlerabatod, 00c906, BGd32ee9, BG062286, BGe46870, BG129ff3, BGf33c4c
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – SMACO 2-in-1 600W Underwater Propeller [EU] (-3 USD)
Price history and price alert
Price history (for all/most countries) for SMACO 2-in-1 600W Underwater Propeller is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).